fix: scope derived graph state to explicit palace

[igorls]

Summary

• make MempalaceConfig accept an explicit palace-path override that outranks ambient environment and file config
• thread the selected palace through hallway and topic/entity tunnel persistence
• cover project, conversation, and format miners so every --palace mining mode keeps derived graph state beside the selected palace
• add regression tests proving selected and default palace sidecars stay isolated

Why

A real local CLI smoke test for the 3.6.0 maintenance work found that:

mempalace --palace /tmp/example/palace mine ...

stored drawers in /tmp/example/palace, but hallway/entity-tunnel derivation instantiated a fresh ambient MempalaceConfig() and wrote into the user's default ~/.mempalace sidecars. This could silently mix graph relationships between palaces.

Validation

• uv run pytest tests/ -q --ignore=tests/benchmarks — 3286 passed, 31 skipped
• uv run ruff check .
• uv run ruff format --check .
• real macOS CLI isolation smoke: mined 3 documentation files / 28 drawers into a disposable explicit palace; 2 hallways landed in its sibling hallways.json, its tunnel file remained isolated, and SHA checks confirmed the default hallway and tunnel files were unchanged

Release context

Discovered while testing the proposed 3.6.0 maintenance fixes on an actual local MemPalace installation. This should land before the release because the bug can contaminate a user's default graph merely by testing another palace with --palace.

[Copilot]

Pull request overview

This PR fixes a palace-isolation bug where derived graph sidecars (hallways / tunnels) could be persisted to the ambient default palace even when the CLI was run with an explicit --palace, by introducing an explicit palace_path override in MempalaceConfig and threading that selected config through miners and graph persistence helpers.

Changes:

• Add MempalaceConfig(palace_path=...) override that takes precedence over env/file config, and use it to derive palace-scoped hallway_file / tunnel_file.
• Thread the selected palace config through mining flows and graph derivation (hallways + topic/entity tunnels) so persistence lands beside the chosen palace.
• Add/extend regression tests ensuring explicit and default palaces’ sidecars stay isolated.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/test_palace_graph_tunnels.py	Adds regression coverage that topic tunnel persistence is scoped by explicit config/palace.
tests/test_miner.py	Updates miner integration tests to assert derived graph computations receive the selected palace config.
tests/test_hallways.py	Adds regression coverage that hallways persistence/listing is scoped by explicit config/palace.
tests/test_format_miner.py	Ensures format miner threads palace config into topic tunnel computation and supports palace override in the fake config.
tests/test_config.py	Adds coverage that explicit palace_path overrides env + file config and yields correct sidecar paths.
mempalace/palace_graph.py	Adds optional config threading for tunnel creation and derived tunnel computation paths.
mempalace/miner.py	Constructs a palace-scoped config for derived graph writes and threads it through topic/entity tunnel + hallway computation.
mempalace/hallways.py	Adds config plumbing to hallways compute + list APIs (but see review comment about deletion).
mempalace/format_miner.py	Uses palace-scoped config when mining formats and when computing topic tunnels.
mempalace/convo_miner.py	Uses palace-scoped config and threads it into hallway computation after convo mining.
mempalace/config.py	Extends MempalaceConfig with explicit palace_path override precedence.

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